Journal
ASTROPHYSICAL JOURNAL
Volume 601, Issue 2, Pages 1129-1135Publisher
IOP PUBLISHING LTD
DOI: 10.1086/380760
Keywords
astrometry; planetary systems; techniques : interferometric
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We have used the Palomar Testbed Interferometer to perform very high precision differential astrometry on the 0.25 separation binary star HD 171779. In 70 minutes of observation, we achieve a measurement uncertainty of approximate to9 muas in one axis, consistent with theoretical expectations. Night-to-night repeatability over four nights is at the level of 16 muas. This method of very narrow angle astrometry may be extremely useful for searching for planets with masses as small as 0.5M(J) around a previously neglected class of stars - so-called speckle binaries. It will also provide measurements of stellar parameters such as masses and distances, useful for constraining stellar models at the 10(-3) level.
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